Replaced get_property by $<TARGET_FILE:flatc>
Replaced get_property by $<TARGET_FILE:flatc>

More details:
http://stackoverflow.com/questions/4346281/path-to-target-output-file and
http://cmake.org/cmake/help/v3.0/prop_tgt/LOCATION.html

Change-Id: Iaa592069c8bc514281c0513e577722b38e9adc14

google/pindrop,google/pindrop,google/pindrop